 |
| Titel |
Deep ocean ventilation, carbon isotopes, marine sedimentation and the deglacial CO2 rise |
| VerfasserIn |
T. Tschumi, F. Joos, M. Gehlen, C. Heinze |
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| ISSN |
1814-9324
|
| Digitales Dokument |
URL |
| Erschienen |
In: Climate of the Past ; 7, no. 3 ; Nr. 7, no. 3 (2011-07-22), S.771-800 |
| Datensatznummer |
250004610
|
| Publikation (Nr.) |
 copernicus.org/cp-7-771-2011.pdf |
|
|
|
|
|
| Zusammenfassung |
| The link between the atmospheric CO2 level and the ventilation state of
the deep ocean is an important building block of the key hypotheses put forth
to explain glacial-interglacial CO2 fluctuations. In this study, we
systematically examine the sensitivity of atmospheric CO2 and its carbon
isotope composition to changes in deep ocean ventilation, the ocean carbon
pumps, and sediment formation in a global 3-D ocean-sediment carbon cycle
model. Our results provide support for the hypothesis that a break up of
Southern Ocean stratification and invigorated deep ocean ventilation were the
dominant drivers for the early deglacial CO2 rise of ~35 ppm
between the Last Glacial Maximum and 14.6 ka BP. Another rise of 10 ppm
until the end of the Holocene is attributed to carbonate compensation
responding to the early deglacial change in ocean circulation. Our reasoning
is based on a multi-proxy analysis which indicates that an acceleration of
deep ocean ventilation during early deglaciation is not only consistent
with recorded atmospheric CO2 but also with the reconstructed opal
sedimentation peak in the Southern Ocean at around 16 ka BP, the record of
atmospheric δ13CCO2, and the reconstructed changes in the
Pacific CaCO3 saturation horizon. |
| |
|
| Teil von |
|
|
|
|
|
|
|
|